1-monocarbocyclic aryl-4-thiocarbam-ylpiperazines and intermediates and processes therefor



United States Patent 3,133,067 l-MONOCARBOCYCHC ARYL-d-THIOCARBAM- YLPIPERAZHNES AND HITERMEDHATES AND PROCESSES THEREFOR Sydney Archer, Bethlehem, N.Y., assignor to Sterling Drug Inc., New York, N.Y., a corporation of Delaware 7 No Drawing. Filed Jan. 30, 1959, Ser. No. 7%,(969 23 Claims. (Cl. 268-268) This invention relates to new 1-m0nocarbocyclic aryl- 4-thiocarbamylpiperazines, acid-addition salts and quaternary ammonium salts thereof, methods of preparation and intermediates therefor.

A preferred aspect of the invention relates to compounds having the formula:

wherein Ar represents a monocarbocyclic iaryl radical and N=B represents a primary amino, a lower-secondary amino or a lower-tertiary amino radical.

in the above general Formula 1, Ar represents a monocarbooyclic aryl radical. It can be phenyl or phenyl substituted by one to three substituents inert under the conditions of the reaction. Preferred substituents are those selected from the group consisting of: halogen (including fluorine, chlorine, bromine and iodine), lower-alkyl, loweralkoxy, nitro, cyano, lower-acyl, loWer-alkylmercapto, lower-alkylsulfonyl, trifluoromethyl or loWer-acylarnino. When the phenyl radical is substituted by two or more substituents, the substituents can be the same or different and can be attached to any of the five available carbon atoms of the phenyl radical. When Ar represents pheny-l substituted by lower-alkyl, loWer-alkoxy, lower acyllower-alkylmercapto, lower-alkylsulfonyl or lower-acylamino, the lower-alkyl, lower-alkoxy, lower-acyl, loweralkylmercapto, lower-alkylsulfonyl or lower-acylamino substituents can be straight or branched and can contain from one to about five carbon atoms. Ar thus stands, inter alia, for phenyl, 4-fluorophenyl, 4-chlorophenyl, 4- bromophenyl, 4-methylpheny1, 4-n-butylpheny1, 4-methoxypheny-l, 4-n-butoxyphenyl, 3-nitrophenyl, 4-cyanophenyl, 4-acetylphenyl, 4-isobutyrylphenyl, 4-methylmercaptophenyl, 4-isopropylmercaptophenyl, 4-methylsulfonylphenyl, 4-isopropylsulfonylphenyl, 3-trifiuoromethylphenyl, 3-acetylarninophenyl, 3-isobutyrylaminophenyl, 3- chloro-4-methylphenyl, 4-chloro-2-rnethylphenyl, and the like.

The amino radical, represented in Formula 1 as N=B,

comprehends pharmacodynamically acceptable primary amino, lower-secondary-amino and lower-tertiaryernino radicals having a total of from two to about twelve carbon atoms. N B thus comprehends such well-known lower secondary-amino radicals illustrated by: mono-(loweralkylyamino and mono-(lower-alkenyl)amino radicals where the lower-alkyl and lower-alkenyl radicals have from one to about six carbon atoms and which can be either straight or branched. The amino radical N B likewise comprehends well-known lower-tertiary-amino radicals having two substituents on the nitrogen atom such as those illustrated above for the lower-secondaryamino radicals, with preferred tertiary-amino radicals being di-(lower-alkyl) amino and di-(lower-alkenyl) amino radicals where the lower-alkyl and lower-alkenyl radicals are alike or different and each alkyl and alkenyl radical has preferably from one to about six carbon atoms. Further when designating lower-tertiary-arnino radicals, N=B includes the usual saturated N-heteromonocyclic radicals having five or six ring atoms, illustrated by: l-piperidyl; (lower-alkylated)-l-piperidyl; l-pyrrolidyl; (lower-alkyL ated)-1-pyrrolidyl and 4-morpholiny1. Thus the entire grouping C(=S)--N=B in Formula I above represents such groupings, inter alia, as: thiooarbaimyl, methylthiocarbamyl, ethylthio'carbamyl, n-propylthiocarbamyl, iso-propylthiocarbamyl, n-pentylthiocarbamyl, propeny'lthiocarbamyl, 3 -methylpropenylthiocarbarnyl [CS NI-ICH(CH )CH=CH 3 ethylpropenylthiooarbamyl [CS-NHCH (C H CH -CH dimethylthiocarb amyl, diethylthiocarbamyl, di-isobutylthiocarbamyl, di-n-hexylthiocarbamyl, di-propenylthiocarbamyl, di-S-ethylpropenylthiocarb amyl, 1-pyrrolidinothiocarbonyl, Z methyl-lpyrrolidinothiocarbonyl, 1 piperidinothiocarbonyl, -2- methyl-l-piperidinothiocarbonyl, 4-morpholin0thiocarbonyl, and the like.

The compounds of Formula I can be prepared by the following reactions in which Ar, has the meaning given above and R and R represent lower-alkyl and loweralkenyl radicals as defined above in the elaboration of N B or which can be joined together to form an N- heterocyclic ring and X represents halogen:

The l-monocarbocyclic arylpiperazines of Formula II which are required for the preparation of the thiocarbamylpiperazines of Formula I are prepared by reacting a monocarbocyclic aryl-amine hydrohalide with a diethanolamine hydrohalide.

The l-monocarbocyclic aryl-4-thiocarbamylpiperazines of Formula III are prepared by reacting the l-rnonocarbocyclic arylpiperazines of Formula H with a molar equivalent amount of an alkali metal or ammonium thiccyanate in an aqueous medium containing one molar equivalent of a mineral acid such as hydrochloric acid thereby producing thiocyanic acid in Slllll which then reacts with the l-monocarbocyclic arylpiperazines to form the l-monocarbocyclic aryl-4-thiocarbamylpiperazines of Formula III. The reaction can be conducted at a temperature in the range of 15-70 C. although it is preferred to carry out the reaction around 35-40 C. The compounds of Formula 1H separate out as the free bases and can be recovered. They can then be converted to their acid-addition salts as will be described later.

The l-monocarbocyclic aryl-4-thiocarbamylpiperazines of Formula IV are prepared by reacting the l-monocarbocyclic arylpiperazines of Formula II with a molar equivalent amount of a lower-alkyl or lower alkenyl isothiocyanate in an appropriate organic solvent inert under the conditions of reaction, at a temperature in the range of 50-150" C. Appropriate solvents are petroleum ether, benzene, toluene, Xylene and the like. It is preferred that the reaction be carried out in petroleum ether at a temperature between about 60 C. and about C. The compounds are isolated in the form of the free base and can be converted to their acid addition salts as will be described later.

The l-monocarbocyclic aiyl-4-thiocarbamylpiperazines or" Formula V are prepared by reacting the monocarbocyclic arylpiperazines of Formula II with a molar equivathiocarbonyl halide in the presence of an acid acceptor at a temperature between about C. and about 25 C. It is preferred to conduct the reaction at a temperature in the range from 0 C. to C., and a preferred acidacceptor is pyridine.

Alternatively the compounds of Formula I can be prepared from the corresponding oxygen analogs of Formula VI wherein the S atom is replaced by an O atom and Ar and N=B have the meanings givenabove by reacting the compounds of Formula VI with phosphorus pentasulfide in an inert organic solvent such as benzene, toluene or xylene at a temperature in the range from 75 C. to 145 C. The reaction is preferably carried out in boiling toluene. able as intermediates in the preparation of compounds of Formula I.

The oxygen analogs of the compounds of Formula I are prepared in a manner similar to the preparation of the thiocarbamyl compounds. Thus the oxygen analogs of the compounds of Formula III are prepared by reacting a l-monocarbocyclic arylpiperazine of Formula H with a molar equivalent amount of an alkali metal or ammonium cyanate in an aqueous medium containing one molar equivalent or" a mineral acid such as hydrochloric acid the shy producing cyanic acid in situ which then reacts with the l-monocarbocyclic arylpiperazine to form the l-rnonocarbocyclic aryl-4-carbamylpiperazines.

Likewise the oxygen analogs of the compounds of Formula IV are prepared by reacting the l-rnonocarbocyclic arylpiperazines of Formula II with a molar equivalent amount of a lowenalkyl or loWer-alkenyl isocyanate in an appropriate solvent inert under the conditions of the reaction at a temperature in the range from 50 C. to 150 C.

Similarly the oxygen analogs of the aryl-4-carbamylpiperazines of Formula V are prepared by reacting the monocarbocyclic arylpiperazines of Formula II with a molar equivalent amount of a di-lower-alkyl-carbamyl halide, a di-lower-alkenylcarbamyl halide or an N-heterocyclic-carbonyl halide in the presence of an acid-acceptor at a temperature between about 0 C. and about 25 C.

Biological evaluation of the compounds of Formula I have shown that they possess useful pharmacological properties and, in particular have hypotensive and schistosomacidal activity as Well as antibacterial activity, thus indicating their usefulness in lowering the blood pressure, in treating schistosomiasis and in combatting bacteria.

Toxicity studies on the compounds, given intravenously in the mouse, have shown that the LD for the compounds is about 40 to 50 mgjkg. LD is defined as the lethal dose for 50% of the animals at that particular dose level. The oral LD is of the order of magnitude of 970 nag/kg.

The acid-addition or quaternary ammonium salts of the compounds of the invention are water-soluble and are the form in which the compounds are conveniently prepared for use. Pharmacologically acceptable salts are salts whose anions are innocuous to the animal organism in pharmacological doses of the salts so that beneficial physiological properties inherent in the free bases are not vitiated by side-effects ascribable to the anions; in other words, the latter do not substantially affect the pharmacological properties inherent in the cations. Appropriate acid-addition salts are those derived from mineral acids such as hydrochloric acid, hydrobromic acid, hydriodic acid, nitric acid, sulfuric acid and phosphoric acid and Thus the compounds of Formula VI are valuof ammonium thiocyanate in 10 m1. of water.

chlorophenyl) 4 in Example 1.

4 organic acids such as acetic acid, citric acid, lactic acid, ethanesulfonic acid and tartaric acid. The quaternary ammonium salts are obtained by reaction of the compounds in the free base form with allryl, alkenyl, or aralkyl esters of inorganic acidsor organic sulfonic acids wherein the alkyl, alkenyl and aralkyl moieties contain from one to about ten carbon atoms. The allcyl, alkenyl or aralkyl esters so used include such compounds as methyl chloride, methyl bromide, methyl iodide, ethyl bromide, propyl chloride, 2-hydroxyethyl bromide, allyl chloride, allyl bromide, methyl sulfate, methyl benzenesulfouate, methyl p-toluenesulfonate, benzyl chloride, benzyl bromide, and substituted benzyl halides such as p-chlorobenzyl chloride, p-nitrobenzyl chloride, o-chlorobenzyl chloride, p-methoxybenzyl chloride, and the like.

The acid-addition salts are prepared either by dissolving the free base in an aqueous solution containing the appropriate acid and isolating the salt by evaporating the solution, or by reacting the free base and acid in an organic solvent, in which case the salt separates directly or can be obtained by concentration of the solution.

The quaternary ammonium salts are prepared by mixing the free base and the alkyl, alkenyl or aralkyl ester in an organic solvent inert under the conditions of 'the.reaction. Heating can be used to facilitate the reaction, al-

though salt formation usually takes place readily at room temperature. The quaternary ammonium salt separates directly or can be obtained by concentration of the:solution.

Although pharmacologically acceptable salts are preferred, those having toxic anions are also useful. All acid-addition salts are useful as intermediates in purifiication or" the free bases, and toxic acid-addition and quaternary ammonium salts are useful as intermediates in preparing pharmacologically acceptable salts by ion exchange procedures- All crystalline salts are useful as characterizing derivatives of the free base.

The structures of the compounds of the invention have been established by the mode of synthesis and corroborated by chemical analysis.

The following examples will further illustrate the invention without the latter being limited thereto.

EXAMPLE 1 1- (3-Chl0rophenyl) -4-Tlziocarbamylpiperazine (III; Ar is 3-ClC H.,)

Ten grams of 1-(3-chlorophenyl)piperazine' (0.05 mole) were dissolved in 50 ml. or" aqueous 1 N-HCl. To the solution was added a solution of 3.8 g. (0.05 mole) The resulting solution became cloudy on slight warming and an oil separated which solidified on chilling. The solid was recrystallized twice from water giving 8.0 g. of 1-(3- thiocarbarnylpiperazine, M.P. 121+ 124.2 C. (corn).

N, 16.43. Found: C, 51.28; H, 5.67; N, 16.50.

EXAMPLE 2 1-(4-cl2l0r0pherzyl)-4-tlziocarbamylpiperazine (Ill; Air is 4-ClC H was prepared from 10 g. 4-chlorophenyl)piperazine and 4.1 g. (0.054 mole) of ammonium thiocyanate in aqueous hydrochloric acid according to the manipulative procedure described above The product was isolated as the free base and recrystallized twice from Water giving 7.0 g. of 1-(4- chlorophenyl)'-4-thiocarbamylpiperazine, M.P. 1720- 176.8 C. (corn).

Analysis.Calcd. for C H CIN S: C, 51.65; H, 5.52;

N, 16.43.. Found: C, 51.65; H, 5.41; N, 16.53.

1 (4-chlorophenyl) 4 thiocarbamylpiperazine, when tested in mice, showed schistosonracidal activity at a dose of rn./kg./'day orally. It also showed in vitro bactericidal activity against Staph. aureus and E. typhi.

(0.05 mole) of 1- 5 EXAMPLE 3 1-(3 chlr0-4-methylphenyl)-4-thi0carbamylpiperazine (III; Ar is 3-Cl-4-CH C H was prepared from 10.6 g. (0.05 mole) of 1-(3-chloro-4-methylphenyl)piperazine and 4.8 g. (0.05 mole) of potassium thiocyanate in aqueous hydrochloric acid according to the manipulative procedure described above in Example 1. The product was isolated as the free base and recrystallized once from water giving 6.4 g. of l-(3-chloro-4-methylphenyl)-4thiocarbamylpiperazine, M.P. l33.2135.8 C. (corn).

Analysis.Calcd. for C H OlN S: C, 53.43; H, 5.98; N, 15.58. Found: C, 53.87; H, 6.29; N, 15.52.

1 (3-chloro-4-metbylphenyl)-4-thiocarbamylpiperazine was found to be schistosomacidal in mice at doses as low as 2.5 mg./ kg./ day orally. it completely cleared monkeys of schistosomiasis in fifteen days when administered oral ly at a dose of 30 mg./kg./day for twenty-one days. It was also shown to be hypotensive at doses from 1.0 to 20 mg./ kg. when administered subcutaneously in the anesthetized renal hypertensive rat. The LD determined intravenously in mice has been shown to be 42:3.6 mg./kg. while the oral LD in mice has been shown to be 970:157 mg./kg.

EXAMPLE 4 1-(4-Br0m0phenyl)-4-Thiocarbamylpiperazine (III; Ar is 4-BrC H By following the manipulative procedure described above in Example 1 and by replacement of the l-(3-chlorophenyhpiperazine used therein by a molar equivalent amount of 1-(4-bromophenyl)piperazine, there can be obtained 1-(4-bromopheny1)-4-thiocarbamylpiperazine.

EXAMPLE 5 l-(4-Methylphenyl)-4-Thiocdrbamylpiperazine AI is 4-CH3OC6H4) By following the manipulative procedure described above in Example 1 and by replacement of the 1-(3-chlorophenyDpiperazine used therein by a molar equivalent amount of 1-(4-methylphenyl)pipenazine, there can be obtained 1-(4-methylphenyl)-4-thiocanbamylpiperazine.

EXAMPLE 6 1- (4-Methoxyphenyl) -4-Thiocarbamylpiperazine (III; Ar is 4-CH OC H By following the manipulative procedure described above in Example 1 and by replacement of the l-(3-chlorophenyl)piperazine used therein by a molar equivalent amount of 1-(4-methoxyphenyl)piperazine, there can be obtained 1-(4-methoxyphenyl)-4-thiocarbamylpiperazine.

EXAMPLE 7 1-(3-Nitr0phenyl)4-Tlzi0carbamylpiperazine (ll-I; Ar is 3-NO C H By following the manipulative procedure desonibed above in Example 1 and by replacement of the 1-(3-chlorophenyDpiperazine used therein by a molar equivalent amount of 1-(3-nitrophenyl)piperazine, there can be obtained 1-(3-nitrophenyl)-4-thiocarbamylpiperazine.

EXAMPLE 8 1 -(4-Cyan0phenyl)-4-Thiocarbamylpiperazine (1H; Ar is 4-ONC H By following the manipulative procedure described above in Example 1 and by replacement of the 1-(3-chlorophenyDpipenazine used therein by a molar equivalent amount of 1-(4-cyanophenyl)piperazine, there can be obtained 1-(4-cyanophenyl)-4-thiocarbamy1piperazine tained 1-(4-acetylphenyl)-44thiocarbarnylpiperazine.

EXAMPLE 10 7 l-(4-Methylmercaptophenyl)-4-Thiocdrbamylpiperazine (III; Ar is 4-CH SC H By following the manipulative procedure described above in Example 1 and by replacement of the 1-(3-chlorophenyDpiper-azine used therein by a molar equivalent amount of 1-(4-methylmercaptophenyl)piperazine, there can be obtained 1 (4 methylmercaptophenyl) 4 thiocarbamylpipenazine. EXAMPLE 11 Y 1- (4-Methylsulf0nylphenyl) -4-Thi0carbamylpiperazine By following the manipulative procedure described above in Example 1 and by replacement of the 1-(3-chlorophenyDpiperazine used therein by a molar equivalent amount of 1-(4-rnethylsulfonylphcnyl)piperazine, there can be obtained 1-(4-methylsulfonylphenyl)-4-thioearbamylpiperazine. EXAMPLE 12 1-(3-Trifluor0methylphenyl) -4-Thi0carbamylpiperazine is 3-CF3C5H4) By following the manipulative procedure described above in Example 1 and by replacement of the 1-(3-chlorophenyDpiper-azine used therein by a molar equivalent amount of 1-(3-trifluoromethylpheny1)pipenazine, there can be obtained 1-(3-tnifluoromethylphenyl) -4-thioearbamylpiperazine.

EXAMPLE 13 1 (3-Acetylantin0phenyl) -4-Thiocarbamylpiperazine m; Ar is 3 -CH CONHC H By treatment of'the 1-(3-nitrophenyl)-4-thiocarbarny1- piperazine prepared in Example 7 with iron and hydrochloric acid, there can be obtained 1-(3-aminophenyl)-4- thiocarbamy-lpiperazine. By treatment of the amino compound thus prepared with a molar excess of acetic anhydr'ide in pyridine, there can be obtained l-(3-acetylan1inophenyl)-4-thiocarbamylpiperazine.

EXAMPLE 14 l -(3-Chlorophenyl -4-Carbamylpipemzine (VI; Ar is 3-ClC H N=B is NH Ten grams (0.05 mole) of 1-(3-chlorophenyl)piperaz.ine were dissolved 50 nil. of aqueous l N-HOl. To the solution was added a solution of 4.1 g. (0.05 mole) of potassium cyanate in 10 of water. On short standing an oil separated which on cooling and scratching solidified. The solid was collected and recrystallized from ethanol to give 8.4 g. of 1-(3-chloropher1yl)-4-carbamylpiperazine,

Anaylsis.-Calcd. for C H OlN O: C, 55.11; H, 5.89;

N, 17.53. Found: ,C, 55.26; H, 6.02; N, 17.66.

EXAMPLE 15 1-(4-chlorophenyl)-4-carbamylpiperazine (VI; Ar is 4- ClC H N=B is NH was prepared from 10.0 g. (0.05 mole) of 1-(4-chlorophenyl)piperazine and 4.1 g. (0.05 mole) of potassium cyanate in aqueous hydrochloric acid according to the manipulative procedure described above in Example 14. The product was isolated as the free base and recrystallized from ethanol giving 7.5 g. of l- (4 chlorophenyl) 4 carbarnylpiperazine, M.P. 198.0- 202.8 C. (corn). 7

Analysis.Calcd. for C H ClN O: C, 55.11; H, 5.89; N, 17.53. Found: C, 54.87; H, 5.87; N, 17.46.

EXAMPLE 16 Analysis.--Calcd. for C H ClN O: C, 56.80; H, 6.36

Cl, 13.98. Found: C, 56.55; H, 6.36; CI, 13.86.

EXAMPLE 17 1-(4 chloro-Z-methylphenyl) 4 carbamylpipemzine (VI; Ar is 4-Cl-2-CH C H N=B is NH was prepared from 10.5 g. (0.05 mole) of 1-(4-chloro-2-methylphenyl)piperazine and 4.1 g. (0.05 mole) of potassium cyanate in aqueous hydrochloric acid according to the manipulative procedure described above in Example 14. The product was isolated as the free base and recrystallized from ethanol to give 3.9 g. of l-(4-chloro-2-methylphenyl)-4-carbamylpiperazine, M1. 2220-2252 C. (corn).

Analysis.Calcd. for C H ClN O: C, 56.80; H, 6.36; N, 16.36. Found: C, 56.82; H, 6.09; N, 16.56.

EXAMPLE 18 1-(4-Br0mophenyl)-4-Carbamylpiperazine (VI; Ar is 4-BrC I-I N=B is NH By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3- chlorophenyl)piperazine used therein by a molar equivalent amount of 1-(4-bromophenyl)piperazine, there can be obtained l-(4-bromophenyl) -4-carbamylpiperazine.

EXAMPLE 19 1 (4-Meflzy1phenyl) -4-'Carbamylpiperazine (VI; Ar is 4-CH C H N=B is NH By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3- chlorophenyl)piperazine used therein by a molar equivalent amount or" 1-(4-methylphenyl)piperazine, there can be obtained 1-(4-methylphenyl)-4-carbamylpiperazine.

EXAMPLE 20 1 (4 -M ethoxyphenyl -4 -Carbamylpiperazine (VI; Ar is 4-CH OC H N=B is NH By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3- ch1orophenyl)pipera.zine used therein by a molar equivalent amount of 1-(4-methoxypheny1) piperazine, there can be obtained 1-(4-methoxyphenyl)-4-carbamylpiperazine.

EXAMPLE 21 1-(3-Nitr0phenyl)-4-Carbaniylpiperazine (VI; Ar is 3-NO C H N=B is NH By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3- chlorophenyl)piperazine used therein by a molar equivalent amount of 1-(3-nitrophenyl)piperazine, there can be obtained 1-(3-nitrophenyl)-4-carbamylpiperazine.

EXAMPLE'ZZ 1- l-Cyanophenyl) -4-Carbamylpiperazine (VI; Ar is 4-CNC H ;N=B1 is NH 7 By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3- chlorophenyl )piperazine used therein by a molar equivalent amount of l-(4-cyanophenylpiperazine, there can be obtained 1-(4'cyanophenyl)-4-carbamylpiperazine.

EXAMPLE 23 J (4-A cetylphenyl -4-Carbamylpiperazine (VI; Ar is 4-CH COC H.;; N=B is NH By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3- chlorophenynpiperazme used therein by a molar equivalent amount of 1-(4-acetylphenyl)piperazine, there can be obtained 1-(4-acetylphenyl) -4-carbamylpiperazine.

. EXAMPLE 24 1 (4-Methylmercaptophenyl) -4-Carbamylpipemzine (VI; Ar is 4-CH SC H N=B is NH By following the manipulative procedure, described above in Example 14 and by replacement of the 1-(3- chlorophenyl)piperazine used therein by a molar equivalent amount of 1-(4-methylmercaptophenyl)piperazine, there can be obtained l-(4-methylmercaptophenyl)-4-carbamylpiperazine.

EXAMPLE 25 1- (4-Methylsulfonylphenyl) -4-Carbamylpz'perazine (VI; Ar is 4-CH SO C H N=B is NH By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3- chlorophenyl)piperazine used therein by a molar equivalent amount of 1-(4-methylsulfonylphenyl)piperazine, there can be obtained 1-(4-methylsulfonylphenyl)-4-carbamylpiperazine.

EXAMPLE 26' 1- (3-Trifluorometl zylphenyl) -4-Carbamylpiperazine (VI; Ar is 3-CF C H N=B is NH By following the manipulative procedure described above in Example 14 and by replacement of the 1-(3 chlorophenynpiperazine used therein by a molar equivalent amount of 1-(3-trifiuoromethylphenyl)piperazine, there can be obtained 1-(3-trifluoromethylphenyl)-4-carbamylpiperazine.

7 EXAMPLE 27 J -(3-A cetylaminophenyl) -4-Carbamylpiperazine (VI; Ar is 3-CH CONI-IC H N=B is NH By treatment of the 1-(3-nitrophenyl)-4-carbamylpiperazine prepared in Example 21 with iron and hydrochloric acid, there can be obtained 1-(3-aminophenyD-4- carbamylpiperazine. By treatment of the amino compound thus prepared With a molar excess of acetic anhydride in pyridine, there can be obtained 1-(3-acetylamino phenyl -4-carbamylpiperazine.

EMMPLE 28 1 (3 Chloro 4 Methylphenyl) 4 Methylthiocarbamylpiperazine (IV; Ar is 3-Cl-4-CH C H R is CH Analysis.-Calcd. for C H ClN S: Cl, 12.54; N,

14.80. Found: Cl, 12.42; N, 14.94. V 1-(3-chloro-4-methylphenyl) 4 methyl-thiocarbamylpiperazine when tested in mice showed schistosomacidal activity at a dose of 50 mg./kg./ day.

The reaction 9 EXAMPLE 29 EXAMPLE 30 1-(3-chl0r0 4 methylphehyl)-4 n butylcarbamylpiperazine (IV; Ar is 3-Cl-4-CH C H R is CH (CH was prepared from 8.5 g. (0.04 mole) of 1-(3-chloro-4- methylphenyl)piperazine and 4.7 g. (0.04 mole) of butyl isothiocyanate in 100 m1. of petroleum ether (Skellysolve B) according to the manipulative procedure described above in Example 28. The product was isolated in the form of the free base and recrystallized from ethanol to give 7.2 g. of 1-(3-chloro-4-methylphenyl)-4-n-butylcarbamylpiperazine, M.P. 112.8114.2 C. (corn).

AnalysisCalcd. for C H ClN S: N, 12.90; Cl, 10.88. Found: N, 12.95; 01, 10.60.

EXAMPLE 31 1 (3-chloro-4-methylphenyl) 4 allylthiocarbamylpiperazine 1V; Ar is 3-Cl-4-CH C H R is CH2CH= CH2) was prepared from 5.2 g. (0.05 mole) of 1-(3-chloro-4- methylphenyDpiperazine and 2.5 g. (0.05 mole) of allyl isothiocyanate in 200 ml. of petroleum ether (Skellysolve B) according to the manipulative procedure described above in Example 28. The product was isolated in the form of the free base and recrystallized from a petroleum ether (Skellysolve A)-ether mixture giving 3.7 g. of 1- (3-chloro-4-methylphenyl) 4 allylthiocarbamylpiperazine, M.P. 77.680.2 C. (corr.).

Analysis.-Calcd. for C H ClN S: C, 58.14; H, 6.51; N, 13.56. Found: C, 58.21; H, 6.13; N, 13.47.

EXAMPLE 32 1-(3-Chl0r0-4-Methylphenyl) -4-Methy lcarbamylpiperazine (VI; Ar is 3-Cl-4-CH C H N=B is NHCH By following the manipulative procedure described above in Example 28 and by replacement of the methyl isothiocyanate used therein by a molar equivalent amount of methyl isocyanate, there can be obtained l-(3-chloro- 4-methylp'henyl) -4 methylc arb amylpiperazine.

EXAMPLE 33 J (3-Chloro 4-Methylphenyl) -4-Ethylcarbamylpiperazine (VI; Ar is 3-Cl-4-CH C H N=B is NHC H By following the manipulative procedure described above in Example 28 and by replacement of the methyl isothiocyanate used therein by a molar equivalent amount of ethyl isocyanate, there can be obtained 1-(3-cl1loro-4- methylphenyl) -4-ethylcarb amylpiperazine.

EXAMPLE 34 J-(3-Chl0r0-4-Methylpher yl)-4-Butylcarbamylpzperazme (VI; Ar is 3-Cl-4CH C H N B is NH(CH CH By following the manipulative procedure described in Example 28 and by replacement of the methyl isothiocyanate used therein by a molar equivalent amount of n-butylisocyanate, there can be obtained 1-(3-ch1oro- 4-methylphenyl) -4-n-butylearb amylpiperazine.

EXAMPLE 35 1 Phenyl-4-Dimethylthiocarbamyl pi perazine Hydrochloride (V; Ar is G l-l R and R are CH l-phenylpiperazine (20.2 g., 0.18 mole) was dissolved.

in ml. of pyridine and the solution was cooled to' 0 C. To the cold solution was added 22.2 g. (0.18 mole) of dimet hylthiocarbamyl chloride in portions over a period of twenty minutes while maintaining the temperature between 0 and 5 C. The reaction mixture was allowed to stand several days and was then treated with 250 ml. of water. The mixture was extracted three times with benzene, the benzene extracts washed with water, dried and the solvent removed. The residue was dissolved in ethanol and the solution treated with a slight excess of alcoholic hydrochloric acid. The resulting solid (18.0 g.) was recrystallized from ethanol giving 12.5 g. of 1-phenyl-4-dimethylthiocarbamylpiperazine hydrochloride, M.P. 187.0l98.6 C. (dec.) (cont).

Analysis.Calcd. for C H N S.HCl: N, 14.70; C1 (ionic), 12.40. Found: N, 14.67; Cl (ionic), 12.54.

By treating an alcoholic or ethereal solution of 1- phenyl-4-dimethylthiocarbamylpiperazine with an ethereal or alcoholic solution of hydrofluoric acid, hydrobromic acid, hydriodic'acid, nitric acid, sulfiuric acid, phosphoric acid, acetic acid, citric acid, lactic acid, ethanesulfonic acid or tartaric acid there can be obtained, respectively, the hydrofluoride, hydrobromide, hydriodide, nitrate, sulfate (or acid sulfate), phosphate (or acid phosphate), acetate, citrate (or acid citrate), lactate, ethane sulfonate or tartrate (or acid tartrate) salts of 1-phenyl-4-dimethylthiocarbarnylpiperazine.

By reacting 1-phenyl-4-dimethylthiocarbamylpiperazine with methyl bromide, methyl iodide, ethyl bromide, allyl bromide, methyl p-toluenesulfonate, benzyl chloride and o-chlorobenzyl chloride, there can be obtained, respectively, the methobrornide, methiodide, ethobromide, allobromide, metho-p toluenesulfonate, benzochloride and ochlorobenzochloride salts.

EXAMPLE 36 .1 phenyl 4 'diethylthiocarbamylpiperazine' hydrochloride (V; Ar is G l-I R and R are C H was pie-- pared from 16.0 g. (0.10 mole) of phenylpiperazine and 15.0 g. (0.10 mole) of diethylthiocarbamyl chloride in 50 ml. of pyridine according to the manipulative procedure described above in Example 35. The product was converted to the hydrochloride salt and recrystallized from ethanol to give 8.8 g. of 1-phenyl-4-diethylthiocarbamylover an ion-exchange resin saturated with chloride ions,

for example, Rohm and Haas Amberlite IRA-400 resin.

EXAMPLE 37 1-(3-chl0r0phenyl) 4 dimethylthiocarbamylpiperazine hydrochloride (V; Ar is 3-ClC I-l R and R are CH was prepared from 27.8 g. (0.142 mole) of 1-(3-chl0rophenyl)piperazine and 17.5 g. (0.142 mole) of dimethylthiocarbamyl chloride in 100 ml. of pyridine according to the manipulative procedure described above in Exampic 35. The product was converted to the hydrochloride salt and recrystallized from ethanol giving 12.5 g. of 1-(3- chlorophenyl)-4-dimethyltl1iocarbamylpiperazine hydrochloride, M.P. 182.0192.0 C. (dec.) (corn).

11 Analysis-Called. for C H ClN StHC1: C, 48.74; H, 5.98; N, 13.12. Found: C, 48.86; H, 5.71; N. 13.08;

XAMPLE 38 .1 -(4-clzloroplzerzyl) 4 dimerhyltlziocarbamylpiperazine hydrochloride (V; Ar is 4-CIC H R and R are CH was prepared from 27 g. (0.138 mole) of 1-(4-cblorophenyl)piperazine and 17 g. (0.138 mole) of dirnethylthiocarbarnyl chloride in 100 ml. ofpyridine according to'the manipulative procedure described above in Exampic 35. The product was converted to the hydrochloride salt and recrystallized from ethanol giving 14.8 g. of 1 (4 chlorophenyl)-4-dimethylthiocarbamylpiperazine hydrochloride, MP. 198.0207.0 C. (dec.) (corn).

Arzalysis.Calcd. for C H ClN SHC1: N, 13.13; Cl

(ionic), 11.07. Found: N, 13.10; Cl (ionic), 11.04.

EXAMPLE 39 J-(S-clzloroplzenyl) 4 dierhylthiocarbamylpiperazine hydrochloride (V; Ar is 341C 3 R and R are 'C H was prepared from 26 g. (0.132 mole) of 1-(3-chlorophenyDpiperazine and 20 g. (0.132 mole) of diethylthiocarbamyl chloride in 100 ml. of pyridine according to the manipulative procedure described above in Example 35. The product Was converted to the hydrochloride salt and recrystallizedfrom ethanol giving 10.5 g. of 1-(3-chlorophenyl) 4 diethylthiocarbamylpiperazine hydrochloride, MP. 18.0193.8 C. (dec) (com).

Analysis.-Calcd. for c ,H c1N,s.nc1= N, 12.06; Cl (ionic), 10.18. Found: N, 12.13; Cl (ionic), 9.89.

EXAMPLE 40 l-(4-chlorophenyl) 4 dietlzylflziocarbamylpiperazine hydrochloride (V; Ar is 4-CIC H R and R are C 51 was prepared from 26.8 g. (0.132 mole) of 1-(4-chlorophenyl)piperazlne and 20 g. (0.132 mole) of diethylthiocarbamyl chloride in 100 ml. of pyridine according to the manipulative procedure described above in Example 35. The product was converted to the hydrochloride salt and recrystallized from ethanol giving 10.0 g. of 1-(4- chlorophenyl) 4 diethylthiocarbamylpiperazine hydrochloride, M1. 2046-2080 C. (dec.). (corr.).

Analysis.Calcd. for C H ClN SHCl: N, 12.06; Cl (ionic), 10.18. Found: N, 11.96; Cl (ionic), 10.40.

Emma 41 I-(S-clzloro L 4 methylplzenyl) 4 diethylthiocarbamylpipemzine hydrochloride (V; Ar is r R and R are (3 1-1 was prepared from 21.1 g. (0.1 mole) of 1-(3-chloro-4-methylphenyl)piperazine and 12.3 g. (0.1 mole) of diethylthiocarbamyl chloride in 50 ml. of

pyridine according to the manipulative procedure described above in Example 35. The product Was converted to the hydrochloride salt and recrystallized once from ethanol and twice from methanol giving 6.5 g. of 1-(3- chloro-4-methylphenyl)-4 diethylthiocarbamylpiperazine hydrochloride, Ml. 211.4216.4 C. (corn);

Anolysis.-Calcd. for .C H ClN SHCl: C, 53.02; H, 6.95; I, 11.60. Found: C, 52.75; 11,672; N, 11.60.

1-(3-chloro-4-rnethylphenyl)-4 diethylthiocarbamylpiperazine hydrochloride when tested in mice was found to be schistosomacidally effective at a dose of 200 mg./kg./day.

EXAMELE 42 1- (3-Chloro-4-Metl1ylplzenyl) -4-Dimetlzylcarbamylpiperazine Hydrochloride By following the manipulative procedure described above in Example 41 and by replacement of the diethylthiocarbamyl chloride used therein by a molar equivalent amount of dimethylcarbamyl chloride, there can be obtained 1- 3-chl0ro-4-methylphenyl -4-dimethylcarbamylpiperazine hydrochloride.

12 EXAMPLE 43 1 3 -Chl or0-4 -M ethyl phenyl -.4 -D ie thylcarba myl- 1 piperazine Hydrochloride v1; Ar is 3-Cl-4-CH 'C H N=B is N(C H By following. the manipulative procedure described above in Example 41 and by replacement of the diethylthiocarbamyl chloride used therein'by a molar equivalent amount of diethylcarbamyl chloride, there can be obtained 1-( 3-chloro-4-methylphenyl) -4-diethylcarbarnylpiperazine hydrochloride. l

' EXAMPLE 44 I (3-Chloro-4-Metlzylphenyl -4- (N-Pyrrolidinothiocarbonyl)piperazine Hydrochloride By following the manipulative procedure described above in Example 41 and by replacement of the diethylthiocarbamyl chloride used therein by a molar equivalent amount of N-pyrrolidinothiocarbonyl chloride, there can be obtained 1-(3-chloro 4 methylphenyl) --4 (N-pyrrolidindinothiocarbonyl)piperazine hydrochloride.

EXAMPLE 45 1-(3 Ciz'loro-4-Metlzylphenyl)-4-(N-Piperidinothiocarhonyhpiperazine Hydrochloride EXAMPLE 46 1 -(3-Cl2 loro-d-M ethylphenyl -4 N 4W orplzolinothiocarbonyl) piperazii ze Hydrochloride By following the manipulative proceduredescribed above in Example 41 and by replacement of the diethylthiocarbamyl chloride used therein by a molar equivalent amount of N-rnorpholinothiocarbonyl chloride, there can be obtained 1-(3-ch1oro 4 riiethy1phenyl)-4 (N morpholinothiocarbonyl)piperazine hydrochloride.

The compounds of the invention can be prepared for use by dissolving under sterile conditions a salt form of the compounds in water (or an equivalent amount of la non-toxic acid if the free base is used), or in a physiologically compatible aqueous medium such as saline, and stored in ampules for intramuscular or intravenous injection. Alternatively, they can be incorporated in tablet or capsule form for oral administration. They are formulated and used in the same way as-known compounds having similar activity.

When used as anti-bacterial agents the compounds are prepared for use by dissolving a salt form in an aqueous medium containing a surfactant, and applied :to a surface to be disinfected by conventional means such as spraying, swabbing, immersion and the like. i

I claim:

1. A member of the group consisting of (A) cornpounds having the formula V s .ArN N ("x-Nd;

wherein Ar represents a member of the group consisting of phenyl and phenyl substituted by from one'to three members of the group consisting of halogen, lower-alkyl, lower-alkoxy, nitro, cyano, lower-alkanoyl, lower-.alkylmercapto, lower-alkylsulfonyl, trifluoromethyl and lowermembers of the group consisting of halogen, lower-alkyl,

1.3 alkanoylamino, and N=B represents a member of the group consisting of amino, mono-(lower-alkyl)amino, mono-(lower-alkenyl)amino, di-(lower-alkyDamino, di- (lower-alkenyDamino, l-piperidyl, (loWer-alkylated)-1- piperidyl, l-pyrrolidyl, (loWer-alkylated)-1-pyrrolidyl and 4-morpholinyl; (B) acid-addition salts; and (C) loweralkyl, lower-alkenyl and monocarbocyclic aryl-loweralkyl quaternary ammonium salts thereof. v

2. An acid-addition salt of a compound having the 6. An acid-addition salt of l-(3-chloro-4-methylphenyl) -4-thioc arb amylpiperazine.

7. An acid-addition salt of 1-(4-chlorophenyl)-4-thi0- carbamylpiperazine.

8. An acid-addition salt of 1-(3-chloro-4-methylphenyl) -4-methylthiocarbamylpiperazine.

9. An acid-addition salt of 1-(3-ohloro-4-methylphenyl) -4-allylthiocarb amylpiperazine.

10. An acid-addition salt of 1-(3-chloro-4-methylphenyl) -4-diethylthiocarbamylpiperazine.

11. A compound having the formula wherein Ar represents a member of the group consisting of phenyl and phenyl substituted by from one to three lower-alkoxy, nitro, cyano, loWer-alkanoyl, lower-alkylmercapto, lower-alkylsulfonyl, trifluoromethyl, and loweralkanoylamino, and N=B represents a member of the group consisting of primary amino, mono-(loWer-alkyl) amino, mono (lower alkenyl) amino, di lower alkyl) amino, di-(lovver-alkenyl)amino, l-piperidyl, (lowera1kylated)-1-piperidyl, l-pyrrolidyl, (lower-alkylated)-1- pyrrolidyl and 4-morpholinyl.

12. A compound having the formula Halogen Lower-alkyl 13. A compound having the formula Lower-alkyl Lower-alkyl Lower-alkyl 14. 1-(4-chlorophenyl)-4-carbamylpiperazine.

15. 1-(3-chloro-4-methylphenyl) 4 carbamylpipera zine.

16. 1-(3-chloropheny1)-4-carbamylpiperazine.

l7. 1-(4-chloro 2 methylphenyl)-4-carbamylpiperazine.

Halogen O II N N-C 14 18. An acid-addition salt of a compound having the formula Halogen S II N NCNH2 19. An acid-addition salt of a compound having the formula Halogen S Lower-alkyl -N /NON\ Lower-alkyl 20. An acid-addition salt of a compound having the formula S Lower-allryl l N\ NC-N\ Lower-alkyl 21. A compound having the formula Halogen Lower-alkyl 22. A compound having the formula Lower-alkyl 23. A process for preparing a compound having the formula ArN wherein Ar represents a member of the group consisting of phenyl and phenyl substituted by from one tothree members of the group consisting of halogen, lower-alkyl, lower-alkoxy, nitro, cyano, lower-alkanoyl, lower-alkylmercapto, lower-alkylsulfonyl, trifluoromethyl, and loweralkanoylamino, and N=B represents a member of the group consisting of primary amino, mono-(lower-alkyl) amino, mono (lower alkenyl)amino, di-(loWer-alkyl) amino, di-(lower-alkenyD-amino, l-piperidyl, (loweralkylated)-1-piperidyl, l-pyrrolidyl, (loWer-alkylated)-1- pyrrolidyl, and 4-morpholinyl which comprises reacting with phosphorous pentasulfide a compound having the formula wherein Ar and N 13 have the meanings given above.

References Cited in the file of this patent UNITED STATES PATENTS 2,519,715 Stewart Aug. 22, 1950 2,602,796 Stewart July 8, 1952 2,617,804 Goldman et a1 Nov. 11, 1952 2,666,055 Conroy Jan. 12, 1954 2,807,617 Dalalian et a1 Sept. 24, 1957 2,880,209 Harfenist Mar. 31, 1959 FOREIGN PATENTS 7 790,800 Great Britain Feb. 19, 1958 OTHER REFERENCES Buck et a1.: Jour. Amer. Chem. Soc., vol. 66, pages 263 266 (1944).

Conant et al.: The Chemistry of Org. Compounds (third edition) (1947), page 342.

Shriner et a1.: Identification of Organic Compounds third edition, pages 174-175 (1949).

Pollard et a1.: Jour. Amer. Chem. Soc., vol. 76, pages 1853-1855 (1954).

Pollard et a1.: Jour. Amer. Chem. Soc., vol. 77, pages 40-42 (1955).

UNITED STATESPATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 133,067 May 12, 1964 Sydney Archer It is hereby certified, that err ent requiring correction and that th corrected below.

or appears in the above numbered pate said Letters Patent should read as Column 5 line 38, for "(11 1; Ar is 4 (III; Ar is 4-CH C H column 9, "described" insert above =-CH OC H read line 73, after Signed and sealed this 15th day of September 1964.

(SEAL) Attest:

Commissioner of Patents 

1. A MEMBER OF THE GROUP CONSISTING OF (A) COMPOUNDS HAVING THE FORMULA 